What is Biased Sample?

Question

In Statistics there is a term 'Biased estimate'. Is it similar to 'Biased sample'. If not, what is definition of Biased sample? Please help within 1 hr, I have no textbook now.

Answer 1

A biased sample and a biased estimate are related buy aren't the same thing. Using a biased sample would likely lead to a biased estimate.

A biased sample is not random, as the first responder says, and is slanted in a way that does not give an unbiased answer.

Answer 2

Definition Of Biased

Answer 3

A biased sample is one that is falsely taken to be typical of a population from which it is drawn. Someone saying "Everyone liked that movie!" might not mention that the "everyone" was them and three of their friends, or a group of the star's fans.

Online and call-in polls are particularly at risk of this error, because the respondents are self-selected. At best, this means the people who care most about an issue will answer; at worst, people listening to a particular radio host, or on a political mailing list, flood the poll.

Biased samples are not always an attempt to mislead: in 1936, in the early days of opinion polling, the American Literary Digest magazine called two million random telephone numbers, questioned the people who answered, and predicted the election result. They got it wrong because, at the time, telephones were far from universal, and telephone owners were not a good sample of the electorate as a whole. In contrast, a poll of only 50,000 citizens selected by George Gallup's organisation successfully predicted the result, leading to the popularity of the Gallup poll.

Answer 4

A sample is used to predict the population behaviour. The size to some extent determines the accuracy of the prediction. The other is the way the sample is chosen. One example often quoted is the use of telephone directories in predicting behaviour. The argument is that only the reasonably well off have Phones hence not representative of the general population.
A lot of common sense is involved. With computers, larger samples and even popilation statistics are feasible. Good Luck in your studies.

Answer 5

Biased sample is when you are taking a sample of data that is not random. For example going to a group of women and asked the question are men smart? or going to death row and asking "is death penalty a good thing". It is when you are taking a sample of data that is not random

Answer 6

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5)In one region, the September energy consumption levels for single-family homes are found to be normally distributed with a mean of 1050 kWh and a standard deviation of 218 kWh. Find P45, which is the consumption level separating the bottom 45% from the top 55%. z = ( x - μ ) / σ P (x < 1022.6058) = P (z < -0.1257) = 0.45 P (1022.6058 < x) = P (-0.1257 < z) = 0.55